Written for beginners by a beginner. This project is my first project using LEDs, and I have documented it to present it to the world. I mounted two green LEDs in a sign that I could hang in my bathroom to solve certain...ahem..."problems."
Step 1: Materials
This is the list of parts I used in my project. All electronic parts were bought from Radioshack. If you can stand to wait, order some parts online. Radioshack has an absurd markup price. I went there because I'm an impatient teenager, and I wanted to do the project NOW. I am using a potentiometer because i wanted to be able to dim the LED, and a switch to turn it on and off.
-A two pack of green LEDs (part number 276-304)
-a SPST (single pole, single throw) toggle switch (part number 275-612)
-a 10 ohm resistor. I just had this lying around.
-3 AA batteries
-a 5K audiotaper Potentiometer (part number 271-1720)
-random pieces of wire that I had lying around.
-an "aquired" sign.
-a soldering iron
Step 2: Drilling
Step one is to drill holes for the switch and the dimmer pot. 1/4" for the switch, and 5/16" for the pot.
Step 3: Making the battery pack
I forgot to buy a battery holder, so insead of having to drive back to Radioshack to buy one, I just soldered three batteries together and duct taped them together. If you feel like it though, go ahead and buy a holder, and skip this step.
This is simple, just solder the "+" end of the battery to the "-" end of the other. It should be labeled on the battery which end is which, but if not, the flat end is the negative side, and the side with the little bump is the positive end.